Panel



FIG. 1 is a front view of a panel showing my new design in an environment of use;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front, right perspective view thereof; and,

FIG. 7 is another perspective view thereof.

The broken lines in FIG. 1 illustrate environmental subject matter which forms no part of the claimed design. The broken lines in FIGS. 3, 5, and 7 illustrate portions of the panel which form no part of the claimed design. 

CLAIM The ornamental design for a panel, as shown and described. 